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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Shull, George Harrison,
    Publication info: Washington, D.C, Carnegie Institution of Washington, 1909
    Holding Institution: University of California Libraries
    Subjects: Bursa bursa-pastoris  Bursa heegeri  Hybridization, Vegetable  
  2. By: Shull, George Harrison,
    Publication info: Washington, Carnegie Institution, 1909
    Holding Institution: Multiple institutions
    Subjects: Bursa bursa-pastoris  Bursa heegeri  Plant hybridization